Yes, world record microwave head as CB, unproven kid from 2nd division and 50m RB who can't breathe on opposing half, let alone dribble are real improvements on before.
No matter if you rate them or not, it is clear the player profile has changed, no more schweinsteiger, sanchez, matic, di maria type signings. Young or prime players, preferably british, who are stepping up to a bigger club and actually want to come to the club for footballing reasons.
Just on those signings, united did overpay for maguire, but he's definitely an improvement. He's better on the ball and in the air than the others and he is one of the best in the league. James was signed to be a squad/development player, his pace has been useful. Wan Bissaka defensively has been great, he does need to improve going forward tho. I notice you didn't mention bruno, maybe because you know he's a great signing
If united are able to get sancho over the line things will be looking very good. Mctominay, Pogba, Bruno in the midfield and rashford, martial, sancho in attack is a very exciting lineup.